Used in selected models of these families: Macintosh II, Performa, Centris, Quadra, Power Mac
Apple CD-ROM drive Mounting Rails, Apple 922-0067, stamped 815-0645. Used in the Macintosh IIvx, IIvi, Performa 600, Power Mac 7100, Centris / Quadra 650 and maybe others. Please check yours, or do some research for your particular application. Sold by the pair with mounting screws.